Can anyone remember this old CBBC programme?

[nappyaddict]

It was about 2 sisters who had to move to Australia under some sort of witness protection thing.

See How They Run?

Yes, it was called See How They Run. The bloke who played Shane (?) in neighbours was the dad. It was a BBC co-production with an Australian company, and I believe it was directed by Graeme Harper who now does Doctor Who.